如何从 Gallery App IOS 内的文档目录显示图像？

Question

I am working in react native and I have downloaded some image from the internet inside the Document directory App folder in IOS. Now, I also want this image to show in IOS native Photos/Gallery App. Concern:

1. Do I need to make another copy of this image at some other folder to achieve it?
2. I have also found a method UIImageWriteToSavedPhotosAlbum(), but I failed to understand the usage, Will it create another copy or I need to enable some magic flag kind of thing to work?

Answer 1

CameraRoll provides access to the local camera roll or photo library.

CameraRoll.saveToCameraRoll(tag, [type]);

Saves the photo or video to the camera roll or photo library.

On Android, the tag must be a local image or video URI, such as "file:///sdcard/img.png".

On iOS, the tag can be any image URI (including local, remote asset-library and base64 data URIs) or a local video file URI (remote or data URIs are not supported for saving video at this time).

Note:

Whenever save image to document directory also need to save that image to CameraRoll / Photolibrary

React-native camera roll extension to store photos in specific album

react-native-store-photos-album